It is possible that the problem lies in the resolution names. We have a disjoint Windows namespace: the domain FQDN is "usc.es" but the servers FQDN is "server1.rpso.usc.es" being "rpso.usc.es", not a Windows subdomain , but a DNS zone.
SnapCenter doesn't understand that and insists on always resolving "server1.usc.es" so we have to fool it with a "hosts" file establishiong alias like "server1.usc.es".
But after installing the agents we find this problem.